Excalibur electronic A-MNL-NIOSPROG-01.1 manual Subtract Immediate, Subi %rB,IMM5

32-Bit Instruction Set

SUBI

Subtract Immediate

Operation:

RA ← RA − (0x00.00 : K : IMM5)

Assembler Syntax:

subi %rB,IMM5

Example:

Not preceded by PFX:

SUBI %L5,6 ; subtract 6 from %L5

Preceded by PFX:

PFX %hi(1000)

SUBI %o3,%lo(1000) ; subtract 1000 from %o3

Description:

Not preceded by PFX:

Subtracts the immediate value from the contents of RA. The immediate value is

in the range of [0..31].

Preceded by PFX:

The Immediate operand is extended from 5 to 16 bits by concatenating the

contents of the K-register (11 bits) with IMM5 (5 bits). The 16-bit immediate value

(K : IMM5) is zero-extended to 32 bits and subtracted from register A.

Condition Codes:

Flags:

N

V

Z

C

∆

∆

∆

∆

N: Result bit 31

V: Signed-arithmetic overflow

Z: Set if result is zero; cleared otherwise

C: Set if there was a borrow from the subtraction; cleared otherwise

Instruction Format:

Ri5

Instruction Fields:

A = Register index of RA operand

IMM5 = 5-bit immediate value

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

0

0

0

0

1

1

IMM5

A

100 Altera Corporation